Preparation method of silicon carbon negative electrode material, silicon carbon negative electrode material and lithium ion battery

Abstract

The invention belongs to the technical field of a lithium ion battery, and relates to a silicon carbon negative electrode material and a preparation method therefor, and the lithium ion battery. The preparation method for the silicon carbon negative electrode material comprises the following steps of (a), by taking silicon monoxide as the substrate material, performing heating treatment on siliconmonoxide to enable silicon monoxide to be subjected to a disproportionation reaction to generate c-SiO; (b), putting c-SiO into a chemical vapor deposition furnace, heating in protective atmosphere until a reaction temperature is reached, and pumping a carbon source to be subjected to a vapor deposition reaction to obtain c-SiO / C, wherein the carbon source is a liquid-state or solid-state compound; and (c), performing corrosion of the c-SiO / C by a corrosive liquid to obtain the silicon carbon negative electrode material c-SiO / Si / C. The preparation method is simple in process and easy to operate; and the prepared silicon carbon negative electrode material has the high lithium storage characteristic as the silicon type material and the high cycling stability as the carbon type material, aswell as high specific capacity, high conductivity and high cycling performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a silicon-carbon negative electrode material, a silicon-carbon negative electrode material and a lithium-ion battery. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. With the continuous development of electronic technology, higher requirements are put forward for lithium-ion batteries, which require higher energy density, better cycle life, better high and low temperature charge and discharge performance and safety performance, etc., which requires lithium The cathode and anode materials for ion batteries need to be further developed and improved. [0003] Carbon materials, such as natural graphite, graphi...

AI Technical Summary

Problems solved by technology

However, the existing methods for preparing silicon-carbon composite materials still have certain shortcomings, for example, the selection range of carbon sources is limited, the cost is high and the effect is not good, and the improvement of cycle performance is not obvious; in addition, The operation steps of the method are complicated, the reaction process is difficult to control, and the stability is poor, which is not conducive to industrial development and application

Images